EP0475399A2 - Verfahren und Vorrichtung zur optischen Abtastung - Google Patents

Verfahren und Vorrichtung zur optischen Abtastung Download PDF

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Publication number
EP0475399A2
EP0475399A2 EP91115415A EP91115415A EP0475399A2 EP 0475399 A2 EP0475399 A2 EP 0475399A2 EP 91115415 A EP91115415 A EP 91115415A EP 91115415 A EP91115415 A EP 91115415A EP 0475399 A2 EP0475399 A2 EP 0475399A2
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EP
European Patent Office
Prior art keywords
optical
beams
rotary
revolution
revolution axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91115415A
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English (en)
French (fr)
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EP0475399A3 (en
EP0475399B1 (de
Inventor
Yuichi Akanabe
Shin Shinotsuka
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Konica Minolta Inc
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Konica Minolta Inc
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Publication of EP0475399A3 publication Critical patent/EP0475399A3/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
    • H04N1/0607—Scanning a concave surface, e.g. with internal drum type scanners
    • H04N1/0621—Scanning a concave surface, e.g. with internal drum type scanners using a picture-bearing surface stationary in the main-scanning direction
    • H04N1/0635—Scanning a concave surface, e.g. with internal drum type scanners using a picture-bearing surface stationary in the main-scanning direction using oscillating or rotating mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
    • H04N1/0607—Scanning a concave surface, e.g. with internal drum type scanners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
    • H04N1/0671—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface with sub-scanning by translational movement of the main-scanning components
    • H04N1/0678—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface with sub-scanning by translational movement of the main-scanning components using a lead-screw or worm

Definitions

  • the present invention relates to an optical beam scanning apparatus in the field of the technique of recording images by scanning optical beams such as laser beams. More particularly, the present invention relates to an optical beam scanning apparatus and method of the type effective for a system where a broad scanning width and a small focussed beam diameter are required, such as an output equipment of a printing plate-making machine or a film printer for forming an original plate for printed substrates.
  • Optical beam scanning apparatuses of this type adopted at the present are roughly divided into the following three classes, and they have merits and demerits.
  • drum scanner system a photosensitive material is wound around a rotary drum, main scanning is performed by rotating the drum by a motor, and subsidiary scanning is effected by moving an optical source unit in a direction substantially rectangular to the direction of main scanning by a subsidiary scanning mechanism, whereby an image is recorded.
  • optical beams going out from a light source is moved in the direction of main scanning by a rotary polygonal mirror rotated by a motor and are focussed by a lens to effect main scanning of optical beams on a photosensitive material.
  • the photosensitive material is moved in a direction substantially rectangular to the direction of main scanning to effect subsidiary scanning. Thus, an image is recorded.
  • main scanning is performed by moving optical beams per se by using a so-called rotary polygonal mirror or rotary pyramidal mirror. Therefore, the moment of inertia of the rotary member can be reduced, and hence, the revolution speed can be increased relatively easily. Furthermore, a plurality of main scannings corresponding to the number of planes of the mirror can be conducted by one revolution, and therefore, a high recording speed can be obtained relatively easily.
  • the focal distance of the lens is generally equal to or larger than the scanning width because of the limitation of design of the lens, and the size of the scanning optical system becomes relatively large.
  • the other system of rotating optical beams per se is a system in which a stationary drum (hereinafter referred to as "cylinder") is used, and optical beams are rotated and scanned in the interior of the cylinder to a photosensitive material attached to the surface of the cylinder to effect recording of images (Japanese Unexamined Patent Publication No. 63-158580).
  • cylinder stationary drum
  • optical beams are rotated and scanned in the interior of the cylinder to a photosensitive material attached to the surface of the cylinder to effect recording of images
  • optical beams from a light source are reflected by a light-reflecting element rotated in the interior of a cylinder by a motor, and by the focussing action of a lens arranged in an optical path, main scanning of the focussed optical beams is performed in the circumferential direction on the photosensitive material attached to the surface of the cylinder, while subsidiary scanning is performed in the axial direction by a subsidiary scanning mechanism, whereby an image is recorded.
  • the photosensitive material can be retained on the inner surface of the cylinder, or the photosensitive material can be retained on the outer surface of a cylinder composed of a transparent material.
  • the former method will be explained in the following description. This method will be called “internal drum scanning system”.
  • the light-reflecting element used in this system will be called “rotary reflecting element” in the following description.
  • optical beams coming substantially in parallel to the revolution axis are reflected substantially in the rectangular direction by the rotary reflecting element rotating with the central axis of the cylinder being as the revolution axis, whereby the photosensitive material attached to the inner surface of the cylinder is scanned and light-exposed.
  • the reflecting direction need not absolutely be the rectangular direction, but a direction different from the rectangular direction can be adopted as the reflecting direction, so far as any bad influences are practically brought about by increase of the distance between the reflecting point and the point of light exposure of the photosensitive material or increase of the magnitude of the optical beams on the surface of the cylinder in the axial direction of the cylinder, caused by adopting the reflecting direction different from the rectangular direction.
  • This system is characterized in that a relatively large scanning width is obtainable with a condenser lens having a short focal distance, as compared with the above-mentioned flat field scanning system
  • a lens having a short focal distance results in an advantage that a small focussed beam diameter required for high image quality recording can be easily obtained.
  • the effective diameter of the condenser lens may be almost equal to the incident beam diameter, and a large lens as used in the flat field scanning mechanism need not be used so as to cope with a broad incident angle.
  • the image quality can be improved more easily than in the flat field scanning system.
  • a rectangular prism or pentagonal prism can be used instead of the mirror.
  • the lens can be rotated integrally with the rotary reflecting element in an optical path formed between the rotary reflecting element and the photosensitive material.
  • the moment of inertia of the rotary members disadvantageously increases, but the focal distance of the lens can be made shorter than the radius of the cylinder and a smaller focussed beam diameter can be easily obtained. Namely, there can be attained an advantage that the diameter of beams incident in the lens, required for obtaining a constant focussed beam diameter, can be reduced.
  • the internal drum scanning system is advantageous over the drum scanner system in that since the moment of inertia of the rotary members is small, the revolution speed can be easily increased and also the recording speed can be easily increased.
  • the internal drum scanning system is advantageous over the flat field scanning system in that the recording size can be easily made compatible with the image quality and the size of the apparatus can be easily reduced.
  • the internal drum scanning system has these merits, but this system is defective in that the recording speed cannot be increased so easily as in the flat field scanning system.
  • the first reason is that use of multiple beams (multi-beams) is difficult.
  • the second reason is that it is difficult to perform a plurality of scannings of optical beams by one revolution using a rotary polygonal mirror or a rotary pyramidal mirror.
  • a primary object of the present invention is to provide an optical beam scanning apparatus and method according to the internal drum scanning system, in which multiple beam scanning is made possible and high-speed recording becomes possible.
  • Another object of the present invention is to provide an optical beam scanning apparatus in which by providing specific structural means and members constituting the optical beam scanning apparatus, the recording speed can be further increased, and also the image quality and the scanning width are improved.
  • an optical beam scanning apparatus which comprises rotary optical means rotating on the revolution axis to introduce optical beams incident substantially in parallel to the revolution axis into a direction substantially rectangular to the revolution axis, wherein the optical beams are rotated and scanned in the interior of a cylinder to a photosensitive material attached to the surface of the cylinder.
  • the rotary optical means can comprise a rotary reflecting element reflecting the optical beams incident to the revolution axis at a predetermined angle.
  • the rotary optical means can comprise a member rotating on the revolution axis and a bundle of optical fibers held on said member, in which one end face of the fiber bundle is arranged in the vicinity of the revolution axis substantially rectangularly to the revolution axis and the other end face is arranged substantially rectangularly to the direction of the radius of revolution.
  • the optical beam rotating means comprises at least one optical structural member, which is constructed so that the structural member rotates with a line substantially coinciding with the revolution axis being as the revolution axis of the structural member, when optical beams are incident in parallel to the revolution axis, the optical beams going out from the structural member are substantially in parallel to the optical beams incident to the structural member, and that in an optical path between the incident point and outgoing point, the optical beams undergo reflection an odd number of times.
  • the optical structural member there can be used a member comprising a refraction surface refracting the optical beams and an odd number of reflecting surfaces, a member comprising an odd number and at least 3 of reflecting surfaces, a member comprising an element diffracting the optical beams and a reflecting surface reflecting the optical beams, and a trapezoidal prism.
  • a plurality of beams incident to the rotary optical means can be rotated at the same revolution speed as that of the rotary optical means with a revolution axis substantially coinciding with the revolution axis of the rotary optical means, and therefore, a plurality of beams going out from the rotary optical means do not cross one another and substantially parallel beam rows can be formed on the surface of the cylinder in the internal drum scanning, whereby multiple beam scanning becomes possible and recording can be performed at a high speed.
  • revolution phase relation between the beam rotating means and the rotary optical means is made variable, it is possible to variably set intervals of a plurality of optical beams in the direction rectangular to the main scanning direction.
  • intervals of the optical beams in the direction rectangular to the main scanning direction are made variable.
  • a plurality of optical beams differing in the wavelength can be used. In this case, multiple color recording can be performed.
  • Fig. 1 is a diagram illustrating the outline of an optical beam scanning apparatus of the internal drum scanning system according to one embodiment of the present invention.
  • Fig. 2 is a diagram illustrating the embodiment of Fig. 1 where a plurality of beams are scanned.
  • Fig. 3 is a diagram illustrating the function of a trapezoidal prism.
  • Fig. 4 is a view of Fig. 3 seen from the outgoing side of the optical beams.
  • Fig. 5 is a diagram illustrating an embodiment in which three trapezoidal prisms are used.
  • Fig. 6 is a diagram illustrating one means for rotating a trapezoidal prism.
  • Fig. 7 is a diagram illustrating another means for rotating a trapezoidal prism.
  • Fig. 8 is a diagram illustrating an embodiment in which a reflecting surface is used.
  • Fig. 9 is a diagram illustrating another embodiment in which a reflecting surface is used.
  • Fig. 10 is a diagram illustrating still another embodiment in which a reflecting surface is used.
  • Fig. 11 is a diagram illustrating a referential example showing that when an even number (2) of reflecting surfaces are used, optical beams are not rotated.
  • Fig. 12 is a diagram illustrating a referential example showing that when an even number (4) of reflecting surfaces are used, optical beams are not rotated.
  • Fig. 13 is a diagram illustrating an embodiment in which a prism and a reflecting surface are used.
  • Fig. 14 is a diagram illustrating an embodiment in which a diffraction lattice and a reflecting surface are used.
  • Fig. 15 is a diagram illustrating an embodiment in which a rotary reflecting element and a trapezoidal prism are synchronously rotated by a single motor.
  • Fig. 16 is a diagram illustrating an embodiment in which a rotary reflecting element and a trapezoidal prism are rotated by different motors, respectively.
  • Fig. 17 is a diagram illustrating an embodiment in which an optical fiber bundle is used as the rotary optical means.
  • Fig. 18 is an enlarged view showing the end face on the incident side of the optical fiber bundle.
  • Fig. 19 is a diagram illustrating an example of the arrangement of the end face on the incident side of the optical fiber bundle.
  • Fig. 20 is a diagram illustrating an example in which the trapezoidal prism is inclined with respect to the revolution axis.
  • Fig. 21 is a diagram illustrating an example of the arrangement of the trapezoidal prism.
  • Fig. 22 is a diagram illustrating the outline of the conventional optical beam scanning apparatus of the internal drum scanning system.
  • Fig. 23 is a diagram of parallel beams, which shows the problem of the conventional technique.
  • Fig. 24 is a diagram showing the state where the reflecting rotary element is rotated by 180 degrees from the position shown in Fig. 23.
  • Fig. 25 is a diagram of inclined beams, which shows the problem of the conventional technique.
  • Fig. 26 is a diagram showing the state where the reflecting rotary element is rotated by 180 degrees from the position shown in Fig. 25.
  • Fig. 27 is a perspective view showing the state where beams cross one another in the conventional technique.
  • Fig. 28 is an elevation of Fig. 27.
  • Optical beams from a light source 71 are reflected by a rotary reflecting element 73 rotated by a motor 72, and the optical beams are focussed on a photosensitive material 76 attached to the inner surface of a cylinder by a condensing action of a lens 74 arranged in an optical path.
  • main scanning of the focussed optical beams is performed, while subsidiary scanning is effected by a subsidiary scanning mechanism 77, whereby an image is recorded.
  • the rotary reflecting element 73 rotating with the center axis of the cylinder 75 being as the revolution axis, the optical beams incident substantially in parallel to the revolution axis are reflected substantially rectangularly, and the optical beams are scanned on the photosensitive material 76 attached to the inner surface of the cylinder 75 to effect light exposure of the photosensitive material 76.
  • each beam is shown as a geometrical optical ray, and also this ray is called “beam”.
  • this ray is called “beam A”.
  • the optical ray indicating beams A is called “beam A”.
  • the practical beam has a definite divergence, but is condensed on one point near the inner surface of the cylinder within the range of the divergence determined by the aberration and diffraction. Accordingly, the beam is explained with reference to an appropriate optical ray within the beam.
  • the beam B is a beam coinciding with the revolution axis of the refractory reflecting element 2.
  • the beams A and C are made incident in the state tilting by a small angle so that the beams A and C become coincident with the beam B on the reflecting surface of the rotary reflecting element 2, when the rotary reflecting element 2 is rotated by 180 degrees, as shown in Fig. 26, from the geometrical consideration, it is understood that the beams A and C are similarly reversed upside down.
  • the beams A, B and C can be incident on the rotary reflecting element while making the beams A, B and C coinciding with one another with respect to the incident position and the incident angle.
  • the beams overlap one another, and therefore, the purpose of multiple beam recording, that is, the purpose of increasing the recording speed by simultaneously scanning a plurality of beams cannot be attained.
  • Figs. 1 and 2 are diagrams illustrating one embodiment of the present invention.
  • Fig. 1 shows the state where a single beam B is incident.
  • Fig. 1 a definite divergence of the beam is illustrated.
  • Reference numeral 1 represents a cylinder to which a photosensitive material is attached, and the photosensitive material, not shown in the drawings, is held on the inner surface of the cylinder.
  • Reference numeral 2 represents a rotary reflecting element as the rotary optical means, and the rotary reflecting element 2 is rotated with a line substantially coinciding with the central axis of the cylinder 1 being as the revolution axis.
  • a rectangular prism is used as the rotary reflecting element 2.
  • Reference numeral 3 represents a trapezoidal prism, which is held by holding means not shown in the drawings.
  • the trapezoidal prism 3 is rotated at a revolution speed corresponding to 1/2 of the revolution speed of the rotary reflecting element 2 in the same direction as of the rotary reflecting element 2 by rotating driving means or revolution-transmitting means not shown in the drawings around a revolution axis substantially coinciding with the above-mentioned revolution axis.
  • the trapezoidal prism 3 constitutes an optical structural member of the optical beam rotating means.
  • Reference numerals 4 and 5 represent lenses.
  • a beam B emitted from point Pb with a certain divergence is made incident as substantially parallel beams on the trapezoidal prism 3 by the lens 5 and the beams going out from the trapezoidal prism 3 are focussed in the vicinity of the inner surface of the cylinder 1 through the rotary reflecting member 2 by the lens 4.
  • the beam B is a line parallel to the plane D of the trapezoidal prism 3 and parallel to or included in a plane rectangular to planes E and F and the beam B is incident at such a position that if the trapezoidal prism is not present and the beam goes straight, the extension of the above-mentioned line coincides with the outgoing beam.
  • This position can be set by appropriately adjusting the length of the trapezoidal prism 3 in the direction of the revolution axis.
  • the divergence of the beam B is set so that the divergence is included within an effective incident region of each of the optical elements 2, 3, 4 and 5.
  • Fig. 2 shows the case where beams A and C are present in close proximity to the beam B.
  • the beam is shown as a light ray, but practically, like the beam B shown in Fig. 1, the beams A and C are emitted from points Pa and Pc with a definite divergence, are made substantially parallel to each other by the lens 5, are passed through the trapezoidal prism 3 and are focussed in the vicinity of the inner surface of the cylinder 1 through the lens 4 and rotary reflecting element 2.
  • the trapezoidal prism is also called "dove prism", and is a prism of a square pillar having a trapezoidal bottom where confronting two sides, other than parallel sides, have an equal angle to the other sides.
  • the side faces E and F of the square pillar form the same angle ⁇ to the side face D, and the side faces D, E and F are rectangular to the bottom face.
  • the side face G is generally rectangular to the bottom face and is parallel to the side face D because the bottom face has a trapezoidal shape.
  • the side face D since the side face D is not used as the reflecting surface or the like, the side face need not have a specific angle. The same holds good also with respect to both the bottom faces of the square pillar, but in order to obtain a sufficient processing precision in the face for which a predetermined angle precision is required or to maintain a certain precision in holding the prism, in general, the prism is processed in the form of a trapezoidal square pillar where the side faces and the bottom face are rectangular.
  • the intended functional effect of the present invention can be attained even if the side face G is not present, that is, the prism is of a square pillar having an isoscales triangular bottom face.
  • the incident angle of the beam A is not limited to an angle of a specific direction but the beam A may be inclined in an optional direction to the beam B.
  • the interval between points Pa and Pb in Fig. 2 is small and hence, the inclination angle is small.
  • the beam A is incident on the face E at point P is reflected on the face D at point Q and goes out from point R on the face F.
  • the beams A and B going out from the trapezoidal prism 3 are designated as beams A0 and B0, respectively, as shown in the drawings.
  • the beam B0 is coincident with the extension of the beam B before the incidence.
  • the face H is a plane including the beams B and B0 and being in parallel to the face D. Supposing that the trapezoidal prism 3 is not disposed, and imaginary beam line along which the beam A is to advance is designated as beam A2, and an imaginary crossing point between the beam A2 and the face F is designated as R2.
  • beam B1 is a beam obtained when the beam B passes through the face D and goes out from the face F1.
  • the beam B1 is parallel to the beam B0 and is mirror-surface-symmetrical with the beam B0 with respect to the face D.
  • the distance between both the beams is designated as d in the drawings.
  • the face H1 is a plane including the beam B1 and being parallel to the face D.
  • the beam obtained when the beam A passing through the face D and going out from the face F1 is made to go out from the face F1 at point S is designated as beam A1.
  • the beam A1 is mirror-surface-symmetric with the beam A0 with respect to the face D.
  • the beam A1 is parallel to the beam A before incidence and they are parallel to the beam A2.
  • the positional relation between the beams A1 and B1 and the positional relation between the beams A2 and B0 will now be described.
  • the former relation corresponds to the case where the beams A and B pass through a parallel plane plate constructed by the faces F1 and F2 and the latter relation corresponds to the case where the beams A and B go straight.
  • the theory of geometrical optics when beams not parallel to each other are passed through the parallel plane plate, an aberration is brought about.
  • the positional relation of the beam A1 to the beam B1 is different from the positional relation of the beam A2 to the beam B0 by a portion corresponding to the aberration generated by the above passage through the parallel plane plate, but as pointed out hereinbefore, the inclinations of the beams A and B are very small, and the above positional relations are substantially the same within the range of the above-mentioned aberration.
  • the beam A1 substantially overlaps the beam A2.
  • the beam A1 and beam A0 which have been mirror-surface-symmetric with each other with respect to the face D are made mirror-surface-symmetric with each other with respect to the face H.
  • the beam A0 is substantially mirror-surface-symmetric with the beam A2 with respect to the face H.
  • the revolution speed of the trapezoidal prism 3 is adjusted to 1/2 of the revolution speed of the rotary reflecting element 2 and both the revolution axes are coincident with each other, the beam incident on the rotary reflecting element 2 is rotated at the same speed as that of the rotary reflecting element 2 with the revolution axis of the rotary reflecting element 2 being as the center.
  • the positional relation between the reflecting surface of the rotary reflecting element and the beam incident thereon is kept substantially constant during the rotation, and a phenomenon of crossing of beams on the inner surface of the cylinder, as mentioned above, is not caused.
  • the beams do not cross one another.
  • the relative movement of the beams and the cylinder in the state where a constant positional relation is maintained between the rotary reflecting element and a plurality of beams is the same as the relative movement in the state where the cylinder is rotated and the rotary reflecting element stops. Accordingly, it is clear that the beams do not cross one another if the sate where the surface of the cylinder is irradiated with beams in the latter state is taken into consideration.
  • a plurality of optical beams need not be placed on the plane including the center line of the beam B outside the trapezoidal prism 3, that is, the line coinciding with the revolution axis of the trapezoidal prism 3, but if the revolution axis of the trapezoidal prism 3 is coincident with the revolution axis of the rotary reflecting element 2, the beam going out from the face F of the trapezoidal prism 3 rotates in follow-up with the rotary reflecting element 2, and the beam is incident on the reflecting face at the same position with the same incidence angle.
  • Fig. 5 illustrates another embodiment of the present invention.
  • three trapezoidal prisms are arranged in an optical path incident on the rotary reflecting element, and these prisms are rotated in opposite directions one another.
  • These prisms are designated as first, second and third trapezoidal prisms 3a, 3b and 3c from the incident side, and for facilitating the understanding the revolution speeds of these prisms are supposed to be N revolutions per minute, -N revolutions per minute and N revolutions per minute, respectively.
  • the crockwise direction with respect to the advance direction of the beam is regarded as the positive direction in the following description.
  • the beam going out from the first trapezoidal prism 3a is incident on the second trapezoidal prism 3b while rotating at a speed of 2N revolutions per minute.
  • the revolution speed of the rotary reflecting element is set at 6N revolutions.
  • the objects of the present invention can be attained at a trapezoidal prism-rotating speed sufficiently lower than the revolution speed of the rotary reflecting element, and conditions required for a motor or revolution-transmitting means can be moderated.
  • adjacent trapezoidal prisms are rotated in the same direction, this results in reduction of the revolution speed of the outgoing beams, and it becomes necessary to increase the revolution speed of the trapezoidal prisms.
  • revolution speeds of the respective trapezoidal prisms need not be adjusted to the same level as in the present embodiment, but it is sufficient if the revolution speeds of the trapezoidal prisms are set so that the revolution speed of the beams going bout from the last trapezoidal prism is coincident with the revolution speed of the rotary reflecting element.
  • Fig. 6 illustrates an embodiment in which a motor 10 is constructed by a cylindrical member as a rotator 11 and a stator 12 surrounding the rotator 11, and a trapezoidal prism 3 is held in the rotator 11.
  • the trapezoidal prism 13 can be directly rotated by the motor 10 without using mechanical revolution-transmitting means such as gears and a high revolution speed can be sufficiently attained.
  • Fig. 7 illustrates an embodiment in which mechanical revolution-transmitting means such as a gear is used for rotating a trapezoidal prism.
  • mechanical revolution-transmitting means such as a gear
  • a bevel gear 14 is rotated by a motor 13 and a trapezoidal prism 3 is rotated through a bevel gear 15.
  • the intended object can be sufficiently attained by such mechanical revolution-transmitting means.
  • a acousto-optic modulator to which a multiple high frequency is to be applied, can be used as the means for obtaining a plurality of beams.
  • beams can be split by optical means such as a beam splitter, or a plurality of independent light sources can be used.
  • Figs. 8, 9, 10, 13 and 14 show the state where each optical structural member is rotated by 90°, in embodiments where the incident beams are rotated by an angle two times the revolution angle of each optical structural member.
  • a plane mirror is preferably used as the mirror, but the intended objects of the present invention can also be attained even by using a mirror having a curved face. If a mirror having a curved face is used, the functions of the lenses 4 and 5 shown in Fig. 1 can be simultaneously exerted.
  • This three-mirror structure is different from the trapezoidal prism in the optical path of each beam in the interior of the structural member, but the three-mirror structure is equivalent to the trapezoidal prism in the above-mentioned effect of rotating outgoing beams.
  • a plane mirror is of the non-aberration optical element, if a plane mirror is used as the mirror, an advantage is attained by use of a plane mirror when the degree of divergence of the optical beam is large and a problem of aberration is caused by use of a trapezoidal prism.
  • the trapezoidal prism is a single optical element, the trapezoidal prism is advantageous in that a simple holding mechanism can be used.
  • Fig. 9 shows an embodiment where five reflecting faces 22a through 22e are used.
  • Figs. 11 and 12 are referential diagrams showing the state where each structural member is rotated by 90°, which are given to demonstrate that when an even number, for example, two or four, of reflecting faces are disposed, there cannot be attained any function of rotating optical beams.
  • a structure shown in Fig. 13 can also be adopted for the optical structural member of the beam rotating means.
  • Fig. 13 shows an embodiment in which the refraction by a prism is combined with a reflecting face.
  • Prisms 24 and 25 have functions corresponding to those of the faces E and F, a reflecting face 26 has a function corresponding to the function of the face D shown Fig. 1.
  • the optical structural member of the present invention can be realized by combining diffraction grating 27a and 27b, which are members diffracting optical beams, with a reflecting surface 28, as shown in Fig. 14.
  • a plurality of beams can be scanned on the inner face of the cylinder.
  • a plurality of motors can be rotated by known PLL control.
  • a predetermined revolution speed ratio can be obtained by using a single motor and mechanical means such as a gear, a chain and a belt.
  • the beam rows should be rectangular or inclined with a certain angle to the main scanning direction, that is the beam-acting direction.
  • the angle is made variable or stationary is determined according to the intended use of the scanning apparatus of the present invention, but in order to set beam rows at a predetermined angle, the revolution phase relation between the rotary reflecting element and the trapezoidal prism or the like should be maintained at a predetermined value.
  • Figs. 27 and 28 show that the aligning directions of the beams A, B and C on the inner surface of the cylinder are changed according to the direction of reflection by the rotary reflecting member.
  • Fig. 15 shows an embodiment in which a rotary reflecting element 2 and a trapezoidal prism 3 are synchronously rotated by a single motor 6 through gears 31, 32, 33 and 34.
  • the revolution phase relation between the rotary reflecting element 2 and trapezoidal prism 3 can be made variable by a clutch mechanism 35.
  • Fig. 16 is a functional block diagram showing an embodiment where the element 2 and prism 3 are controlled by different synchronous motors.
  • phase-detecting circuits 43 and 44 of the respective motors when motors 41 and 42 are started and the revolution speeds arrive at a predetermined level, the phases are detected by phase-detecting circuits 43 and 44 of the respective motors, and if necessary, the rotation signal are passed through a frequency divider 45. Then, the difference of the phases is detected by a phase difference-detecting circuit 46 and is compared with the reference phase difference, set by a reference phase difference-setting circuit 47, by a phase difference comparator 48, and when reference signals are given to both of the synchronous motors 41 and 42 by a reference signal generator 80 through amplifiers 81 and 82, the phase of the reference signal given to one synchronous motor is shifted by a phase-shifting circuit 49 to adjust the phases of the synchronous motors 41 and 42.
  • the phase difference is shown by a display circuit 50, and the set value of the reference phase difference can be changed by a reference phase difference-setting circuit 47.
  • the above-mentioned means for detecting the revolution phase difference between rotary members or adjusting the phase difference to a variable or fixed predetermined value is well known, and the detection can be realized by a known member such as a slit or pinhole formed on a member rotating integrally with a rotary member, or a hall device.
  • the adjustment can be accomplished by PLL control or the method in which the phase of an alternating current applied to the synchronous motor described above with reference to Fig. 16 is controlled.
  • the direction of alignment of beams focussed on the face of the cylinder can be changed by rotating the direction of alignment of points Pa, Pb and Pc, from which three beams are generated, with the advance direction of beams being as the revolution axis, whereby intervals in the direction rectangular to the main scanning direction on the face of the cylinder is made variable.
  • scanning line intervals of main scanning by optical beams can be changed while keeping the revolution phases of the rotary reflecting element and optical beam-rotating means stationary.
  • rotary reflecting element such as a prism or a mirror
  • optical fiber bundle composed of a plurality of optical fibers
  • rotary reflecting element 2 shown in Fig. 2 is replaced by an optical fiber bundle 90.
  • optical fiber bundle 90 The same members as shown in Fig. 2 are represented by the same reference numerals in Fig. 17.
  • the optical fiber bundle 90 is composed of three optical fibers, but obviously, the number of the optical fibers is not limited to three.
  • independent optical fibers corresponding to optical beams, A, B and C are represented by reference numerals 90a, 90b and 90c, respectively.
  • Reference numeral 91 represents a holding member for holding the optical fiber bundle, which is rotated by the motor 6.
  • Reference numeral 92 represents a focussing member such as a lens, which focusses a plurality of beams going out from the optical beam rotating means such as the trapezoidal prism 3 on the incident end face of the optical fiber bundle 90.
  • Fig. 18 is an enlarged view showing the incident end face of the optical fiber bundle 90.
  • a core of the optical fiber 90a, through which light practically passes, is represented by 90a-1, while a clad is represented by 90a-2.
  • cores and clads are similarly represented.
  • the end faces of the respective fibers and the respective beams are rotated at the same revolution speed on the same revolution axis, and the same positional relation is always maintained.
  • optical beam and the end face of the optical fiber need not be in a 1:1 correspondence relation, but in order to utilize the energy of the optical beam effectively, it is preferred that each beam be incident on one optical fiber.
  • the incident end faces of the optical fiber bundle need not be aligned on a straight line or on a circumference, but it is sufficient if the arrangement of the end faces is substantially coincident with the arrangement of the positions of the optical beams A, B and C focusssed by the optical system comprising the lens 5, the trapezoidal prism 3 and the lens 92.
  • the optical beams going out from the outgoing end faces of the optical fibers are focussed on the face of the cylinder by focussing means such as a lens 93.
  • the optical beam is expressed as the ray by a geometric line, but practically, each optical beam has a certain divergence determined by the characteristics of the optical fiber and the wavelength of light.
  • the lens 93 like the optical fiber bundle 90, is fixed to the rotary holding member 91.
  • the lens 93 exerts the same function as that of the lens 4 shown in Fig. 2, that is, the function of focussing optical beams on the cylinder, but the position of the lens 93 is limited to the outgoing side of the optical fiber bundle as the rotary optical means.
  • the alignment angle of a plurality of optical beams on the face of the cylinder is determined by the direction of alignment of the outgoing end faces of the optical fiber bundle and the focussing means.
  • the present embodiment is different from the embodiment using the rotary reflecting element in that the direction of alignment of the optical beams on the face of the cylinder cannot be made variable by adjusting the phase relation between the rotary optical means and the optical beam rotating means.
  • the arrangement of the outgoing end faces of the optical fiber bundle may be such that when an image on the end faces is projected on the face of the cylinder by the lens 93, an arrangement suitable for optical beam recording is attained.
  • FIG. 19 An example of the arrangement is illustrated in Fig. 19.
  • the end faces should be substantially equidistantly arranged with respect to the direction rectangular to main scanning. with respect to the main scanning direction, the equidistant arrangement is not absolutely necessary, but as in case of the equidistant arrangement shown in Fig. 19 (a), the timing difference in image signals given to respective beams can be made constant. In the case where many optical fibers are used, the arrangement shown in Fig. 19 (b) can be adopted so as to prevent increase of the visual field of the lens 93.
  • the arrangement angle of the optical beams on the face of the cylinder can be adjusted by adjusting the arrangement angle of outgoing end faces of the optical fiber bundle.
  • each beam of multiple beam scanning can be of a single color, or beams differing in the wavelength can be used.
  • optical beams differing in the wavelength can be simultaneously used and a single beam or a plurality of beams can be used with respect to each wavelength. Furthermore, there can be adopted a method in which recording is carried out by using a plurality of beams having the same wavelength and then, recording is performed by using a plurality of beams having a different wavelength.
  • the optical beam scanning apparatus of the present invention where beams differing in the wavelength are used is suitably adopted when recording is effected on a color photosensitive material such as a color film or a color printing sheet by a laser optical source or the like.
  • means utilizing refraction such as a prism
  • the optical beam rotating means be constructed by combining reflecting faces appropriately.
  • a prism can be used in the case where the difference of the refractive index poses no practical problem according to the intended use of the optical beam scanning apparatus. The same holds good with respect to an element diffracting optical beams, but the difference by the wavelength is larger in the diffraction than in the refraction and the diffraction is relatively unsuitable for optical beams differing in the wavelength.
  • Fig. 20 shows the case where the trapezoidal prism is inclined with respect to the revolution axis thereof. If there is such an inclination, the outgoing beams from the trapezoidal prism change the direction thereof according to the revolution position of the trapezoidal prism. Accordingly, because of the presence of two positions of the trapezoidal prism, corresponding to one position of the rotary optical element, the directions of the outgoing beams cannot be parallel to one another. Accordingly, in the arrangement shown in Fig. 1 where beams incident on the lens 4 in parallel are focussed on the face of the cylinder, the beams are not focussed at the same position on the face of the cylinder. Therefore, interval unevenness is caused in scanning lines on the scanning surface and periodical image unevenness appears with two revolutions of the rotary optical means being as one cycle.
  • the trapezoidal prism makes one revolution while the rotary optical means makes two revolutions.
  • one revolution is performed while the optical beams are cut off. Namely, scanning of the optical beams is performed at every other revolution.
  • revolution of 360 degrees of the trapezoidal prism only a specific revolution range of 180 degrees is utilized, and therefore, unevenness of scanning line intervals owing to dislocation of the focussing position, as shown in Fig. 20, is not caused, and the problem described above with respect to the arrangement shown in Fig. 17 is not caused. Even if one revolution of the two revolutions is thus made invalid, as compared with the internal drum scanning system using a single beam, a scanning speed corresponding to 1/2 of the beam number of multiple beam can be obtained at the same revolution speed.
  • the trapezoidal prism is located at the position between the lenses 4 and 5 where the beams are substantially parallel to one another as shown in Fig. 1.
  • the optical beam rotating means such as a trapezoidal prism
  • the function of rotating optical beams can be attained at any optional point between the rotary optical means and the light source, and therefore, this feature is included in the scope of the present invention.
  • another problem resides in that although since the trapezoidal prism or the like is located at a position conjugate with the scanning face, the influence on the position on the scanning face by a variation of the beam direction is not serious, a variation of the beam position results in interval unevenness in the scanning lines on the scanning face. Accordingly, in order to reduce the variation of the position of the beam after going-out from the trapezoidal prism or the like, it is necessary to maintain a high precision in the coaxiality of the trapezoidal prism or the like and the factor having an influence on the variation of the position.
  • the arrangement position of the trapezoidal prism may be determined based on the above consideration in view of the difficulty or easiness in design and fabrication.
  • the optical beams move at a high speed in the direction of main scanning, but the light exposure time for recording one picture element has a definite length. Accordingly, it is preferred that the shape of beams focussed on the recording face be small in the direction of main scanning and be large in the direction rectangular thereto, because the shape of the recorded picture element is likely to have the same size in the longitudinal and lateral direction.
  • the single focussed beam per se is scanned on the face of the cylinder while rotating. This is quite obvious if the beam B is regarded as the center of the single beam in Figs. 23 and 27 and beams A and C are regarded as peripheral portions of the single beam. Accordingly, in the conventional internal drum scanning system the above-mentioned focussed beams shape having a length/width ratio other than 1 can hardly be used.
  • the focussed beam is not scanned on the surface of the cylinder while rotating, and a certain length/width ratio can be maintained with respect to the direction of the main scanning line.
  • the optical beam scanning apparatus of the present invention by giving a predetermined revolution to a plurality of beams incident on the rotary optical means by the optical structural member as the optical beam rotating means, crossing of a plurality of beams going out from the rotary optical means can be prevented, and substantially parallel beam rows can be formed on the face of the cylinder, whereby multiple beam scanning becomes possible and also high-speed recording becomes possible.
  • optical beam scanning can be performed while maintaining a high image quality, a high recording speed and a broad scanning width.
  • the optical beam scanning apparatus of the present invention is suitable for an apparatus for recording images by scanning laser beams, for which a broad scanning width and a small focussed beam diameter are required, such as an output equipment for outputting dots for the producting of a printing plate or a laser output equipment for the production of an original plate for printed substrates.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Facsimile Scanning Arrangements (AREA)
EP91115415A 1990-09-14 1991-09-12 Verfahren und Vorrichtung zur optischen Abtastung Expired - Lifetime EP0475399B1 (de)

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JP24277890 1990-09-14

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EP0475399A3 EP0475399A3 (en) 1992-11-25
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WO1996035211A1 (de) * 1995-04-29 1996-11-07 Linotype-Hell Ag Lichtstrahl-ablenkvorrichtung
EP0827325A2 (de) * 1996-08-30 1998-03-04 Bayer Corporation Mehrstrahlabtaster mit akusto-optischem Element zur Abtastung von Bildaufzeichnungsoberflächen
EP0701158A3 (de) * 1994-09-07 1998-04-15 Fuji Photo Film Co., Ltd. Gerät zur Aufzeichnung von Bildern auf der Innenfläche eines Zylinders
EP0840493A2 (de) * 1996-10-30 1998-05-06 Fuji Photo Film Co., Ltd. Gerät und Verfahren zum mehrstrahliges Abtasten einer Innenfläche
US5864418A (en) * 1996-08-30 1999-01-26 Bayer Corporation Agfa Division Multi-beam scanner with mechanically moving element for scanning imaging surfaces
US5877494A (en) * 1996-07-29 1999-03-02 Agfa Division, Bayer Corporation Beam error correction using movable correction element
US5892610A (en) * 1997-07-10 1999-04-06 Agfa Division--Bayer Corporation Scanning system with error-correcting deflector
US5909323A (en) * 1996-07-29 1999-06-01 Agfa Corporation Beam alignment correction element assembly
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Cited By (28)

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Publication number Priority date Publication date Assignee Title
WO1993002376A1 (de) * 1991-07-22 1993-02-04 Linotype-Hell Ag Lichtstrahl-ablenkvorrichtung
EP0557998A2 (de) * 1992-02-28 1993-09-01 Konica Corporation Optisches Strahlabtastgerät
EP0557998A3 (en) * 1992-02-28 1993-11-03 Konishiroku Photo Ind Optical beam scanning apparatus
US5309274A (en) * 1992-02-28 1994-05-03 Konica Corporation Optical beam scanning apparatus
EP0632434A1 (de) * 1993-06-30 1995-01-04 Scitex Corporation Ltd. Plotter mit innenaufzeichnender Trommel
EP0701158A3 (de) * 1994-09-07 1998-04-15 Fuji Photo Film Co., Ltd. Gerät zur Aufzeichnung von Bildern auf der Innenfläche eines Zylinders
US5877887A (en) * 1995-04-29 1999-03-02 Linotype-Hell Ag Light beam deflection means
WO1996035211A1 (de) * 1995-04-29 1996-11-07 Linotype-Hell Ag Lichtstrahl-ablenkvorrichtung
US5909323A (en) * 1996-07-29 1999-06-01 Agfa Corporation Beam alignment correction element assembly
US5877494A (en) * 1996-07-29 1999-03-02 Agfa Division, Bayer Corporation Beam error correction using movable correction element
US6191897B1 (en) 1996-07-29 2001-02-20 Agfa Corporation Beam alignment correction element assembly
US5796511A (en) * 1996-08-30 1998-08-18 Agfa Division, Bayer Corporation Multi-beam scanner with acousto-optic element for scanning imaging surfaces
US5864418A (en) * 1996-08-30 1999-01-26 Bayer Corporation Agfa Division Multi-beam scanner with mechanically moving element for scanning imaging surfaces
EP0827325A2 (de) * 1996-08-30 1998-03-04 Bayer Corporation Mehrstrahlabtaster mit akusto-optischem Element zur Abtastung von Bildaufzeichnungsoberflächen
US5923461A (en) * 1996-08-30 1999-07-13 Agfa Corporation Scanner with deflection element for scanning imaging surfaces
EP0827325A3 (de) * 1996-08-30 1999-10-20 Bayer Corporation Mehrstrahlabtaster mit akusto-optischem Element zur Abtastung von Bildaufzeichnungsoberflächen
US6144483A (en) * 1996-08-30 2000-11-07 Agfa Corporation Optical scanning with phase shifted beam
EP0840493A3 (de) * 1996-10-30 1998-09-23 Fuji Photo Film Co., Ltd. Gerät und Verfahren zum mehrstrahliges Abtasten einer Innenfläche
EP0840493A2 (de) * 1996-10-30 1998-05-06 Fuji Photo Film Co., Ltd. Gerät und Verfahren zum mehrstrahliges Abtasten einer Innenfläche
US6369929B2 (en) 1996-10-30 2002-04-09 Fuji Photo Film Co., Ltd. Method and apparatus for inner face scanning with multi beams
EP1571824A1 (de) * 1996-10-30 2005-09-07 Fuji Photo Film Co., Ltd. Gerät und Verfahren zum mehrstrahliges Abtasten einer Innenfläche
US5892610A (en) * 1997-07-10 1999-04-06 Agfa Division--Bayer Corporation Scanning system with error-correcting deflector
WO2001029833A3 (en) * 1999-10-19 2002-02-14 Raytheon Co Digital laser image recorder
US6396042B1 (en) 1999-10-19 2002-05-28 Raytheon Company Digital laser image recorder including delay lines
US6855923B2 (en) 1999-10-19 2005-02-15 Raytheon Company Scanning a beam of light in a digital image recorder
WO2001029833A2 (en) * 1999-10-19 2001-04-26 Raytheon Company Digital laser image recorder
EP1216829A2 (de) * 2000-12-15 2002-06-26 Heidelberger Druckmaschinen Aktiengesellschaft Mehrstrahl-Abtastvorrichtung
EP1216829A3 (de) * 2000-12-15 2004-10-27 Heidelberger Druckmaschinen Aktiengesellschaft Mehrstrahl-Abtastvorrichtung

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EP0475399A3 (en) 1992-11-25
DE69112320D1 (de) 1995-09-28
DE69112320T2 (de) 1996-03-21
US5214528A (en) 1993-05-25
EP0475399B1 (de) 1995-08-23

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